Pliny j



(No Model.) J. WEIGHT. 7

" VALVE RESEATING TQOL.

No. 400,989. Patented Apr. 9, 18 89..

UNITED STATES PATENT OFFICE.

PLlN-Y J. \YRIGIl'l, OF MINNEAPOLIS, MINNESO'IA, .ls'SIGXOR- OF ONE-HALFTO CLARA E. SAMPSON, OF SA .llli. PLACE.

VALVETRESEATING Too 1..

SPECIFICATION forming part of Letters Patent No. 400,989, dated. April9, 1889.

Application filed August 24, 1888.

T aZZ whom it may concern: I

I 3e it known that I, PLINY J. \\"RIGH1,?L citizen of the United States,and a resident of the city of lllinneapolis, county of llennepin,

State of Minnesota, have invented a certain new and useful Improvementin Valve-Reseating Tools, of which. the following is a specification,reference being had to the accompanying drawings.

'My invention relates to valve-seat-dressing tools, and is in the natureof an improvement on the construction shown in the patent granted tomyself and Samuel Rust of date May 29, 1883, under N 0. 278,478. In myformer patentI used a disk-shaped cutter on the end of a revolubletoolshaft and a guide below the tool adapted to fit the opening'in theclearing.

valve-seat for the purpose of centering the cutter. In practice,however, I found that this construction was imperfect. I found that theguide in the valve-seat opening could not be relied on to hold thetool-shaft at right angles to the valve-seat, and therefore a truesurface could not be produced. I found that the disk-cutter would notclear itself of the filings. I also found it impracticable to getsufficienhpressure on the tool without throwing it off-its center.

My present invegiftion was designed to over come these defects; and itconsists of the construction hereinafterdescribed, and particu larlypointed out in the claims.

In the drawings, like letters referring to like parts, Figure 1 is'avertical section of the preferred form of my device. Fig. 2 is a similarview of a modification, and Figs, 3 and i 4 are detached views, in sideelevation and plan, respectively, of my improved form of cutter.

- the tool-stem.

lower end of said shaft, formed integral there- Serial No. 283,625. (Nomodel.)

with. The lower end of the tool-stem provided with a screw-threaded holein the line .of its axis.

- ing the cutter to the cutter-head.

The cutterF is ofaspecial construction.- It is in shape like the frustumof an oblong pyramid. The lower surface, f, has a file finish withdiagonal grooving, and its inclin ed surfaces f" arealso files withdiagonal grooves. This constitutes aflat and a conical file inone.;1i.ere,:lmth of which are selflhe flat file-face adapts the cutterto dress the horizontal 'valve-seats and the conical file-face to theconical valve-seats. I11 virtue of its oblongshape and the diagonalgrooving of the file-surfaces it is self-clearing. It does not clogwiththe filings.

G is a centering device or valve-stein guide. It consists of a blockprovided with annular shoulders g at right angles to its axis andreduced sections g',having screw-threaded peripheries, adapting the sameto different-sized cap-seats. It is also provided. with a hollow axisadapted to allow the outward passage of hen screwed down into positionin the cap-seat, the adjacent shoulder will come to a true bearing withthe top thereof. In case the form of pressure device shown in Fig. 2 beused, the bore of the guide block G should be of a size just to fit thevalve-stem.

II is a supplementary bushing or guideseat for adapting the device to agreater diversity of sizes of cap-seat openings. Its use is obvious 011reference to Fig. 1. Y

K and K are pressure-producingdevices. In Fig.1 1 have shown for thepurpose a sleeve adapted to closely fit the tool-stein, having ascrew-threaded exterior adapted to fit the screw-threaded interior ofthe guide? block G, the lower end being adapted to bear against the topof the cutter-head with a pressure variable at will by a hand-wheel, InFig. 2 I dispense with the screw and sub- IOO stitute a link, L, alever, M, and a sleeve, N, between flanges P on the tool-stein. ver M isfulcrume'd on the sleeve N, and is connected by the link L to theguide-block G.

The upper end of tbe'tool-shaft D is provided with a suitable head, d,for the applicationof' a crank, Q. This crank is prefer ably apaWl-and-ratchet crank, as shown in Fig. 1, the crank being. swiveled tothe head of the toolstein and provided with a'springpawl, q, forengaging with the ratchet q,

rigidly attached to the tool-shaft head. The

, purpose of the ratchet-crank is to better adapt the tool to work incorners and close to a wall.

It will be understood that instead of mak" ing the cutter with both theflat and the inclined file-surfaces separate cutters may be used for thetwo classes of seats, cutters with oblong flat file-surfaces fordressing flat valveseatsand oblong cutters with inclined filesurfacesfor the ball-valve seats. The n1aterial point is, that the file-surfaceson the cutter be not continuous.

There "must be clearing-spaces between them, The cutter may take anyform having a broken periphery-as, for example, a star or a cross; but acontinuous surface will not clear itself;

a The operation of the device is evident. The tool being in position,with the cutter on the valve-seat, pressure is applied thereto throughthe screw or the lever, and the crank f is revolved. The le- As theshaft is perfectly centered at right angles to the plane of the cutter,the seat is readily brought to a true'bea ring. In this manner a valvemay be seated on an old seat as well as to a new one quickly andcheaply, eifecting a large economy.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

1. Ina valvercseating device, the combination, with a revoluble shaft,of a file connected to the lower end of said shaft at right anglesto'its'axis, of a size to cover at anyone time only a part of thesurfaceto be dressed, whereby the file is rendered self-clearing, substantiallyas described. l

2. In a valve-reseat-ing device, the combi nation, with a revolubleshaft, of a cutter detachably connected thereto, having a flatfilesurface on its under side and inclined file-surfaces on its ends,substantially as described, whereby the tool is adaptable to dressingboth flat and conical valve-seats.

3. The combination, with the shaft D, of the cutter F, having flat andinclined file-surfaces f f, the centering-guide G, the bushing II, thescrew Kj, and the ratchet-crank Q q q, substantially as described.

PLINY J. WRIGHT,

In presence of- JAS. F. WILLIAMSoN, EMMA F. ELMoRn.

